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linux/drivers/ata/pata_ali.c
Colin Ian King 237fe8885a ata: pata_ali: remove redundant return statement 
A return statement is unnecessarily complicated, currently value
in variable mask is bitwise-masked and the variable is being
updated and then returned. Just updating the mask is all that is
required as the following statement is a return.

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
2022-01-14 15:17:17 +09:00

653 lines
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/*
* pata_ali.c - ALI 15x3 PATA for new ATA layer
* (C) 2005 Red Hat Inc
*
* based in part upon
* linux/drivers/ide/pci/alim15x3.c Version 0.17 2003/01/02
*
* Copyright (C) 1998-2000 Michel Aubry, Maintainer
* Copyright (C) 1998-2000 Andrzej Krzysztofowicz, Maintainer
* Copyright (C) 1999-2000 CJ, cjtsai@ali.com.tw, Maintainer
*
* Copyright (C) 1998-2000 Andre Hedrick (andre@linux-ide.org)
* May be copied or modified under the terms of the GNU General Public License
* Copyright (C) 2002 Alan Cox <alan@redhat.com>
* ALi (now ULi M5228) support by Clear Zhang <Clear.Zhang@ali.com.tw>
*
* Documentation
* Chipset documentation available under NDA only
*
* TODO/CHECK
* Cannot have ATAPI on both master & slave for rev < c2 (???) but
* otherwise should do atapi DMA (For now for old we do PIO only for
* ATAPI)
* Review Sunblade workaround.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <scsi/scsi_host.h>
#include <linux/libata.h>
#include <linux/dmi.h>
#define DRV_NAME "pata_ali"
#define DRV_VERSION "0.7.8"
static int ali_atapi_dma;
module_param_named(atapi_dma, ali_atapi_dma, int, 0644);
MODULE_PARM_DESC(atapi_dma, "Enable ATAPI DMA (0=disable, 1=enable)");
static struct pci_dev *ali_isa_bridge;
/*
* Cable special cases
*/
static const struct dmi_system_id cable_dmi_table[] = {
{
.ident = "HP Pavilion N5430",
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
DMI_MATCH(DMI_BOARD_VERSION, "OmniBook N32N-736"),
},
},
{
.ident = "Toshiba Satellite S1800-814",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
DMI_MATCH(DMI_PRODUCT_NAME, "S1800-814"),
},
},
{ }
};
static int ali_cable_override(struct pci_dev *pdev)
{
/* Fujitsu P2000 */
if (pdev->subsystem_vendor == 0x10CF && pdev->subsystem_device == 0x10AF)
return 1;
/* Mitac 8317 (Winbook-A) and relatives */
if (pdev->subsystem_vendor == 0x1071 && pdev->subsystem_device == 0x8317)
return 1;
/* Systems by DMI */
if (dmi_check_system(cable_dmi_table))
return 1;
return 0;
}
/**
* ali_c2_cable_detect - cable detection
* @ap: ATA port
*
* Perform cable detection for C2 and later revisions
*/
static int ali_c2_cable_detect(struct ata_port *ap)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
u8 ata66;
/* Certain laptops use short but suitable cables and don't
implement the detect logic */
if (ali_cable_override(pdev))
return ATA_CBL_PATA40_SHORT;
/* Host view cable detect 0x4A bit 0 primary bit 1 secondary
Bit set for 40 pin */
pci_read_config_byte(pdev, 0x4A, &ata66);
if (ata66 & (1 << ap->port_no))
return ATA_CBL_PATA40;
else
return ATA_CBL_PATA80;
}
/**
* ali_20_filter - filter for earlier ALI DMA
* @adev: ATA device
* @mask: received mask to manipulate and pass back
*
* Ensure that we do not do DMA on CD devices. We may be able to
* fix that later on. Also ensure we do not do UDMA on WDC drives
*/
static unsigned long ali_20_filter(struct ata_device *adev, unsigned long mask)
{
char model_num[ATA_ID_PROD_LEN + 1];
/* No DMA on anything but a disk for now */
if (adev->class != ATA_DEV_ATA)
mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
ata_id_c_string(adev->id, model_num, ATA_ID_PROD, sizeof(model_num));
if (strstr(model_num, "WDC"))
mask &= ~ATA_MASK_UDMA;
return mask;
}
/**
* ali_fifo_control - FIFO manager
* @ap: ALi channel to control
* @adev: device for FIFO control
* @on: 0 for off 1 for on
*
* Enable or disable the FIFO on a given device. Because of the way the
* ALi FIFO works it provides a boost on ATA disk but can be confused by
* ATAPI and we must therefore manage it.
*/
static void ali_fifo_control(struct ata_port *ap, struct ata_device *adev, int on)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
int pio_fifo = 0x54 + ap->port_no;
u8 fifo;
int shift = 4 * adev->devno;
/* ATA - FIFO on set nibble to 0x05, ATAPI - FIFO off, set nibble to
0x00. Not all the docs agree but the behaviour we now use is the
one stated in the BIOS Programming Guide */
pci_read_config_byte(pdev, pio_fifo, &fifo);
fifo &= ~(0x0F << shift);
fifo |= (on << shift);
pci_write_config_byte(pdev, pio_fifo, fifo);
}
/**
* ali_program_modes - load mode registers
* @ap: ALi channel to load
* @adev: Device the timing is for
* @t: timing data
* @ultra: UDMA timing or zero for off
*
* Loads the timing registers for cmd/data and disable UDMA if
* ultra is zero. If ultra is set then load and enable the UDMA
* timing but do not touch the command/data timing.
*/
static void ali_program_modes(struct ata_port *ap, struct ata_device *adev, struct ata_timing *t, u8 ultra)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
int cas = 0x58 + 4 * ap->port_no; /* Command timing */
int cbt = 0x59 + 4 * ap->port_no; /* Command timing */
int drwt = 0x5A + 4 * ap->port_no + adev->devno; /* R/W timing */
int udmat = 0x56 + ap->port_no; /* UDMA timing */
int shift = 4 * adev->devno;
u8 udma;
if (t != NULL) {
t->setup = clamp_val(t->setup, 1, 8) & 7;
t->act8b = clamp_val(t->act8b, 1, 8) & 7;
t->rec8b = clamp_val(t->rec8b, 1, 16) & 15;
t->active = clamp_val(t->active, 1, 8) & 7;
t->recover = clamp_val(t->recover, 1, 16) & 15;
pci_write_config_byte(pdev, cas, t->setup);
pci_write_config_byte(pdev, cbt, (t->act8b << 4) | t->rec8b);
pci_write_config_byte(pdev, drwt, (t->active << 4) | t->recover);
}
/* Set up the UDMA enable */
pci_read_config_byte(pdev, udmat, &udma);
udma &= ~(0x0F << shift);
udma |= ultra << shift;
pci_write_config_byte(pdev, udmat, udma);
}
/**
* ali_set_piomode - set initial PIO mode data
* @ap: ATA interface
* @adev: ATA device
*
* Program the ALi registers for PIO mode.
*/
static void ali_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
struct ata_device *pair = ata_dev_pair(adev);
struct ata_timing t;
unsigned long T = 1000000000 / 33333; /* PCI clock based */
ata_timing_compute(adev, adev->pio_mode, &t, T, 1);
if (pair) {
struct ata_timing p;
ata_timing_compute(pair, pair->pio_mode, &p, T, 1);
ata_timing_merge(&p, &t, &t, ATA_TIMING_SETUP|ATA_TIMING_8BIT);
if (ata_dma_enabled(pair)) {
ata_timing_compute(pair, pair->dma_mode, &p, T, 1);
ata_timing_merge(&p, &t, &t, ATA_TIMING_SETUP|ATA_TIMING_8BIT);
}
}
/* PIO FIFO is only permitted on ATA disk */
if (adev->class != ATA_DEV_ATA)
ali_fifo_control(ap, adev, 0x00);
ali_program_modes(ap, adev, &t, 0);
if (adev->class == ATA_DEV_ATA)
ali_fifo_control(ap, adev, 0x05);
}
/**
* ali_set_dmamode - set initial DMA mode data
* @ap: ATA interface
* @adev: ATA device
*
* Program the ALi registers for DMA mode.
*/
static void ali_set_dmamode(struct ata_port *ap, struct ata_device *adev)
{
static u8 udma_timing[7] = { 0xC, 0xB, 0xA, 0x9, 0x8, 0xF, 0xD };
struct ata_device *pair = ata_dev_pair(adev);
struct ata_timing t;
unsigned long T = 1000000000 / 33333; /* PCI clock based */
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
if (adev->class == ATA_DEV_ATA)
ali_fifo_control(ap, adev, 0x08);
if (adev->dma_mode >= XFER_UDMA_0) {
ali_program_modes(ap, adev, NULL, udma_timing[adev->dma_mode - XFER_UDMA_0]);
if (adev->dma_mode >= XFER_UDMA_3) {
u8 reg4b;
pci_read_config_byte(pdev, 0x4B, &reg4b);
reg4b |= 1;
pci_write_config_byte(pdev, 0x4B, reg4b);
}
} else {
ata_timing_compute(adev, adev->dma_mode, &t, T, 1);
if (pair) {
struct ata_timing p;
ata_timing_compute(pair, pair->pio_mode, &p, T, 1);
ata_timing_merge(&p, &t, &t, ATA_TIMING_SETUP|ATA_TIMING_8BIT);
if (ata_dma_enabled(pair)) {
ata_timing_compute(pair, pair->dma_mode, &p, T, 1);
ata_timing_merge(&p, &t, &t, ATA_TIMING_SETUP|ATA_TIMING_8BIT);
}
}
ali_program_modes(ap, adev, &t, 0);
}
}
/**
* ali_warn_atapi_dma - Warn about ATAPI DMA disablement
* @adev: Device
*
* Whine about ATAPI DMA disablement if @adev is an ATAPI device.
* Can be used as ->dev_config.
*/
static void ali_warn_atapi_dma(struct ata_device *adev)
{
struct ata_eh_context *ehc = &adev->link->eh_context;
int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
if (print_info && adev->class == ATA_DEV_ATAPI && !ali_atapi_dma) {
ata_dev_warn(adev,
"WARNING: ATAPI DMA disabled for reliability issues. It can be enabled\n");
ata_dev_warn(adev,
"WARNING: via pata_ali.atapi_dma modparam or corresponding sysfs node.\n");
}
}
/**
* ali_lock_sectors - Keep older devices to 255 sector mode
* @adev: Device
*
* Called during the bus probe for each device that is found. We use
* this call to lock the sector count of the device to 255 or less on
* older ALi controllers. If we didn't do this then large I/O's would
* require LBA48 commands which the older ALi requires are issued by
* slower PIO methods
*/
static void ali_lock_sectors(struct ata_device *adev)
{
adev->max_sectors = 255;
ali_warn_atapi_dma(adev);
}
/**
* ali_check_atapi_dma - DMA check for most ALi controllers
* @qc: Command to complete
*
* Called to decide whether commands should be sent by DMA or PIO
*/
static int ali_check_atapi_dma(struct ata_queued_cmd *qc)
{
if (!ali_atapi_dma) {
/* FIXME: pata_ali can't do ATAPI DMA reliably but the
* IDE alim15x3 driver can. I tried lots of things
* but couldn't find what the actual difference was.
* If you got an idea, please write it to
* linux-ide@vger.kernel.org and cc htejun@gmail.com.
*
* Disable ATAPI DMA for now.
*/
return -EOPNOTSUPP;
}
/* If its not a media command, its not worth it */
if (atapi_cmd_type(qc->cdb[0]) == ATAPI_MISC)
return -EOPNOTSUPP;
return 0;
}
static void ali_c2_c3_postreset(struct ata_link *link, unsigned int *classes)
{
u8 r;
int port_bit = 4 << link->ap->port_no;
/* If our bridge is an ALI 1533 then do the extra work */
if (ali_isa_bridge) {
/* Tristate and re-enable the bus signals */
pci_read_config_byte(ali_isa_bridge, 0x58, &r);
r &= ~port_bit;
pci_write_config_byte(ali_isa_bridge, 0x58, r);
r |= port_bit;
pci_write_config_byte(ali_isa_bridge, 0x58, r);
}
ata_sff_postreset(link, classes);
}
static struct scsi_host_template ali_sht = {
ATA_BMDMA_SHT(DRV_NAME),
};
/*
* Port operations for PIO only ALi
*/
static struct ata_port_operations ali_early_port_ops = {
.inherits = &ata_sff_port_ops,
.cable_detect = ata_cable_40wire,
.set_piomode = ali_set_piomode,
.sff_data_xfer = ata_sff_data_xfer32,
};
static const struct ata_port_operations ali_dma_base_ops = {
.inherits = &ata_bmdma32_port_ops,
.set_piomode = ali_set_piomode,
.set_dmamode = ali_set_dmamode,
};
/*
* Port operations for DMA capable ALi without cable
* detect
*/
static struct ata_port_operations ali_20_port_ops = {
.inherits = &ali_dma_base_ops,
.cable_detect = ata_cable_40wire,
.mode_filter = ali_20_filter,
.check_atapi_dma = ali_check_atapi_dma,
.dev_config = ali_lock_sectors,
};
/*
* Port operations for DMA capable ALi with cable detect
*/
static struct ata_port_operations ali_c2_port_ops = {
.inherits = &ali_dma_base_ops,
.check_atapi_dma = ali_check_atapi_dma,
.cable_detect = ali_c2_cable_detect,
.dev_config = ali_lock_sectors,
.postreset = ali_c2_c3_postreset,
};
/*
* Port operations for DMA capable ALi with cable detect
*/
static struct ata_port_operations ali_c4_port_ops = {
.inherits = &ali_dma_base_ops,
.check_atapi_dma = ali_check_atapi_dma,
.cable_detect = ali_c2_cable_detect,
.dev_config = ali_lock_sectors,
};
/*
* Port operations for DMA capable ALi with cable detect and LBA48
*/
static struct ata_port_operations ali_c5_port_ops = {
.inherits = &ali_dma_base_ops,
.check_atapi_dma = ali_check_atapi_dma,
.dev_config = ali_warn_atapi_dma,
.cable_detect = ali_c2_cable_detect,
};
/**
* ali_init_chipset - chip setup function
* @pdev: PCI device of ATA controller
*
* Perform the setup on the device that must be done both at boot
* and at resume time.
*/
static void ali_init_chipset(struct pci_dev *pdev)
{
u8 tmp;
struct pci_dev *north;
/*
* The chipset revision selects the driver operations and
* mode data.
*/
if (pdev->revision <= 0x20) {
pci_read_config_byte(pdev, 0x53, &tmp);
tmp |= 0x03;
pci_write_config_byte(pdev, 0x53, tmp);
} else {
pci_read_config_byte(pdev, 0x4a, &tmp);
pci_write_config_byte(pdev, 0x4a, tmp | 0x20);
pci_read_config_byte(pdev, 0x4B, &tmp);
if (pdev->revision < 0xC2)
/* 1543-E/F, 1543C-C, 1543C-D, 1543C-E */
/* Clear CD-ROM DMA write bit */
tmp &= 0x7F;
/* Cable and UDMA */
if (pdev->revision >= 0xc2)
tmp |= 0x01;
pci_write_config_byte(pdev, 0x4B, tmp | 0x08);
/*
* CD_ROM DMA on (0x53 bit 0). Enable this even if we want
* to use PIO. 0x53 bit 1 (rev 20 only) - enable FIFO control
* via 0x54/55.
*/
pci_read_config_byte(pdev, 0x53, &tmp);
if (pdev->revision >= 0xc7)
tmp |= 0x03;
else
tmp |= 0x01; /* CD_ROM enable for DMA */
pci_write_config_byte(pdev, 0x53, tmp);
}
north = pci_get_domain_bus_and_slot(pci_domain_nr(pdev->bus), 0,
PCI_DEVFN(0, 0));
if (north && north->vendor == PCI_VENDOR_ID_AL && ali_isa_bridge) {
/* Configure the ALi bridge logic. For non ALi rely on BIOS.
Set the south bridge enable bit */
pci_read_config_byte(ali_isa_bridge, 0x79, &tmp);
if (pdev->revision == 0xC2)
pci_write_config_byte(ali_isa_bridge, 0x79, tmp | 0x04);
else if (pdev->revision > 0xC2 && pdev->revision < 0xC5)
pci_write_config_byte(ali_isa_bridge, 0x79, tmp | 0x02);
}
pci_dev_put(north);
ata_pci_bmdma_clear_simplex(pdev);
}
/**
* ali_init_one - discovery callback
* @pdev: PCI device ID
* @id: PCI table info
*
* An ALi IDE interface has been discovered. Figure out what revision
* and perform configuration work before handing it to the ATA layer
*/
static int ali_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
{
static const struct ata_port_info info_early = {
.flags = ATA_FLAG_SLAVE_POSS,
.pio_mask = ATA_PIO4,
.port_ops = &ali_early_port_ops
};
/* Revision 0x20 added DMA */
static const struct ata_port_info info_20 = {
.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_PIO_LBA48 |
ATA_FLAG_IGN_SIMPLEX,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.port_ops = &ali_20_port_ops
};
/* Revision 0x20 with support logic added UDMA */
static const struct ata_port_info info_20_udma = {
.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_PIO_LBA48 |
ATA_FLAG_IGN_SIMPLEX,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.udma_mask = ATA_UDMA2,
.port_ops = &ali_20_port_ops
};
/* Revision 0xC2 adds UDMA66 */
static const struct ata_port_info info_c2 = {
.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_PIO_LBA48 |
ATA_FLAG_IGN_SIMPLEX,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.udma_mask = ATA_UDMA4,
.port_ops = &ali_c2_port_ops
};
/* Revision 0xC3 is UDMA66 for now */
static const struct ata_port_info info_c3 = {
.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_PIO_LBA48 |
ATA_FLAG_IGN_SIMPLEX,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.udma_mask = ATA_UDMA4,
.port_ops = &ali_c2_port_ops
};
/* Revision 0xC4 is UDMA100 */
static const struct ata_port_info info_c4 = {
.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_PIO_LBA48 |
ATA_FLAG_IGN_SIMPLEX,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.udma_mask = ATA_UDMA5,
.port_ops = &ali_c4_port_ops
};
/* Revision 0xC5 is UDMA133 with LBA48 DMA */
static const struct ata_port_info info_c5 = {
.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_IGN_SIMPLEX,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.udma_mask = ATA_UDMA6,
.port_ops = &ali_c5_port_ops
};
const struct ata_port_info *ppi[] = { NULL, NULL };
u8 tmp;
int rc;
rc = pcim_enable_device(pdev);
if (rc)
return rc;
/*
* The chipset revision selects the driver operations and
* mode data.
*/
if (pdev->revision < 0x20) {
ppi[0] = &info_early;
} else if (pdev->revision < 0xC2) {
ppi[0] = &info_20;
} else if (pdev->revision == 0xC2) {
ppi[0] = &info_c2;
} else if (pdev->revision == 0xC3) {
ppi[0] = &info_c3;
} else if (pdev->revision == 0xC4) {
ppi[0] = &info_c4;
} else
ppi[0] = &info_c5;
ali_init_chipset(pdev);
if (ali_isa_bridge && pdev->revision >= 0x20 && pdev->revision < 0xC2) {
/* Are we paired with a UDMA capable chip */
pci_read_config_byte(ali_isa_bridge, 0x5E, &tmp);
if ((tmp & 0x1E) == 0x12)
ppi[0] = &info_20_udma;
}
if (!ppi[0]->mwdma_mask && !ppi[0]->udma_mask)
return ata_pci_sff_init_one(pdev, ppi, &ali_sht, NULL, 0);
else
return ata_pci_bmdma_init_one(pdev, ppi, &ali_sht, NULL, 0);
}
#ifdef CONFIG_PM_SLEEP
static int ali_reinit_one(struct pci_dev *pdev)
{
struct ata_host *host = pci_get_drvdata(pdev);
int rc;
rc = ata_pci_device_do_resume(pdev);
if (rc)
return rc;
ali_init_chipset(pdev);
ata_host_resume(host);
return 0;
}
#endif
static const struct pci_device_id ali[] = {
{ PCI_VDEVICE(AL, PCI_DEVICE_ID_AL_M5228), },
{ PCI_VDEVICE(AL, PCI_DEVICE_ID_AL_M5229), },
{ },
};
static struct pci_driver ali_pci_driver = {
.name = DRV_NAME,
.id_table = ali,
.probe = ali_init_one,
.remove = ata_pci_remove_one,
#ifdef CONFIG_PM_SLEEP
.suspend = ata_pci_device_suspend,
.resume = ali_reinit_one,
#endif
};
static int __init ali_init(void)
{
int ret;
ali_isa_bridge = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533, NULL);
ret = pci_register_driver(&ali_pci_driver);
if (ret < 0)
pci_dev_put(ali_isa_bridge);
return ret;
}
static void __exit ali_exit(void)
{
pci_unregister_driver(&ali_pci_driver);
pci_dev_put(ali_isa_bridge);
}
MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for ALi PATA");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, ali);
MODULE_VERSION(DRV_VERSION);
module_init(ali_init);
module_exit(ali_exit);
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